Snow Leopard not connecting to SMB servers

this has happened in past, thought time looked it.

have imac 27" running snow leopard, pc , couple of nas drives connected network. connect them without issues, "connect server". imac left on time, goes sleep when not being used , works without issues, every , again cant connect network. internet works fine, no connection shared resources.

ip addresses still listed in finder when select them imac tries connect, (without error messages), cant. tried disconnecting network , rejoining, didn't work. have done before, tried restart failed, leaving background picture.

forced imac shutdown , when restarted normal.....but idea why happens? idea having force shutdown?

help.

 

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